I bought the original edition of this book in 1981 and over the years I have found it an invaluable reference work. While planning a visit to the Somme / Ypres areas earlier this summer I saw that an updated edition of this book was still on sale, but wondered if it was worth getting. I am glad I decided to go ahead with my purchase. The 100 extra pages contain a wealth of additional information (such as the existence of a British trench section in Auchonviliers) and the book details many of the changes (new monuments, car parking facilities, disappearing relics) that have happened in the 30+ years since I bought the original. I was also pleased to see that the incorrect labelling of the German Front Line on the aerial photograph of Newfoundland Park has been corrected. Anyone still using an early edition of this book will not regret buying the current edition. Anyone else looking for a comprehensive, authoritative guidebook should not hesitate to buy this book.